六角螺母为普通螺母。

The hexagonal nut is a common nut.

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简体中文标题：六角头螺母.1型。产品等级A和B。

English Name:Hexagon nuts, style 1. Product grades A and B.

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简体中文标题：六角头螺母.1型。产品等级A和B。

English Name:Hexagon nuts, style 1. Product grades A and B.

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